Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec82c5b43076ceba…

MALICIOUS

PDF

84.8 KB Created: 2021-07-20 06:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b849f363c57854d55485107e5f869770 SHA-1: 1ba3f4aded4b114e8d369f9a5b97e9413ffd40fa SHA-256: ec82c5b43076ceba50d0b141cb9dad5364ba0843d3d8c95b958426c12edc7d60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pk-kuepfer.ch/ckfinder/userfiles/files/73457615257.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7k3vuotlub3bua6t1kvo6iqunm/gunuketetoza.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/71313712973.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb401bf7f6---rasaw.pdfIn PDF document text
    • http://prestopc.it/upload/file/darurax.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/gedofamunezagut.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u8868umfl7ue8nloohfaaug4op/nopomalodu.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/26486159464.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/xosuxatawifadorotitinozi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/piwepewijimax.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6264968c7---komoxesuzukopakonipab.pdfIn PDF document text
    • http://aven.su/userfiles/file/bopuvomuzeganozed.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fecd1f06e798ef65ce4b52f0d0a3cb48/10040428870.pdfIn PDF document text
    • http://rld-carbon.ru/file/wazimajutowupox.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f765bf6f2f0d9e61ffe07a7e9a9e344d/76445220528.pdfIn PDF document text
    • https://ip-pharma.net/data/files/22581754344.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/98328099407.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160860a211fec7---xarotefuvorodujako.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/fezon.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/26a6c75b20dd6593a55f469fb3a392be/68876243219.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/98176495802.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/63316bb33f2ce2a78af5ce6e6a5eb7b2/nogiwelekukuguwopa.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/buubi4dclmqqcv9e3ro0rr3a83/86530356020.pdfIn PDF document text
    • https://ocw.tw/uploads/files/metubokuzaxerofobulanebus.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1u29sivkgth4v8sklbij1fbold/70038047335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=different+animal+crossing+flowersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 16868 bytes
SHA-256: 553bdfaec886fe9a125b85dd6562a1961077b9cf200d676e39326b9d3845a1b7
font_01_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 10764 bytes
SHA-256: 0421531f0822f8bbaa9b0294b197017ecb96b556b398f557359e9d62ee5a0436
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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